Bernina 590 Instructions Manual page 185

Attachment
> Remove the hook.
> Give one drop of BERNINA oil down in the hook race.
> Give one drop of oil in each of the two oil depots so that the felts are damp and make sure that the red-
> Hold the hook at the pin in the center with two fingers.
> Lead the hook, lower edge ahead, angular top-down behind the hook race cover.
> Position the hook with the two lugs meeting the openings in the hook, the colored mark on the hook
> Insert the hook.
> Close the hook race cover and the fastening bracket until the release bracket engages.
> As a check, turn the handwheel.
> Insert the bobbin case.
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marked surface of the hook sleeve remains free of oil.
driver should be visible through the hole in the hook.
– The hook is magnetic and therefore fastened to the correct position.